ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #ifndef OPENSSL_NO_KRB5
 119 # include "kssl_lcl.h"
 120 #endif
 121 #include <openssl/buffer.h>
 122 #include <openssl/rand.h>
 123 #include <openssl/objects.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/md5.h>
 126 #include <openssl/bn.h>
 127 #ifndef OPENSSL_NO_DH
 128 # include <openssl/dh.h>
 129 #endif
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver);
 132 static int dtls1_get_hello_verify(SSL *s);
 133
 134 static const SSL_METHOD *dtls1_get_client_method(int ver)
 135 {
 136     if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 137         return (DTLSv1_client_method());
 138     else if (ver == DTLS1_2_VERSION)
 139         return (DTLSv1_2_client_method());
 140     else
 141         return (NULL);
 142 }
 143
 144 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
 145                           DTLSv1_client_method,
 146                           ssl_undefined_function,
 147                           dtls1_connect,
 148                           dtls1_get_client_method, DTLSv1_enc_data)
 149
 150     IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
 151                           DTLSv1_2_client_method,
 152                           ssl_undefined_function,
 153                           dtls1_connect,
 154                           dtls1_get_client_method, DTLSv1_2_enc_data)
 155
 156     IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
 157                           DTLS_client_method,
 158                           ssl_undefined_function,
 159                           dtls1_connect,
 160                           dtls1_get_client_method, DTLSv1_2_enc_data)
 161
 162 int dtls1_connect(SSL *s)
 163 {
 164     BUF_MEM *buf = NULL;
 165     unsigned long Time = (unsigned long)time(NULL);
 166     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 167     int ret = -1;
 168     int new_state, state, skip = 0;
 169 #ifndef OPENSSL_NO_SCTP
 170     unsigned char sctpauthkey[64];
 171     char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 172 #endif
 173
 174     RAND_add(&Time, sizeof(Time), 0);
 175     ERR_clear_error();
 176     clear_sys_error();
 177
 178     if (s->info_callback != NULL)
 179         cb = s->info_callback;
 180     else if (s->ctx->info_callback != NULL)
 181         cb = s->ctx->info_callback;
 182
 183     s->in_handshake++;
 184     if (!SSL_in_init(s) || SSL_in_before(s)) {
 185         if (!SSL_clear(s))
 186             return -1;
 187     }
 188
 189 #ifndef OPENSSL_NO_SCTP
 190     /*
 191      * Notify SCTP BIO socket to enter handshake mode and prevent stream
 192      * identifier other than 0. Will be ignored if no SCTP is used.
 193      */
 194     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 195              s->in_handshake, NULL);
 196 #endif
 197
 198 #ifndef OPENSSL_NO_HEARTBEATS
 199     /*
 200      * If we're awaiting a HeartbeatResponse, pretend we already got and
 201      * don't await it anymore, because Heartbeats don't make sense during
 202      * handshakes anyway.
 203      */
 204     if (s->tlsext_hb_pending) {
 205         dtls1_stop_timer(s);
 206         s->tlsext_hb_pending = 0;
 207         s->tlsext_hb_seq++;
 208     }
 209 #endif
 210
 211     for (;;) {
 212         state = s->state;
 213
 214         switch (s->state) {
 215         case SSL_ST_RENEGOTIATE:
 216             s->renegotiate = 1;
 217             s->state = SSL_ST_CONNECT;
 218             s->ctx->stats.sess_connect_renegotiate++;
 219             /* break */
 220         case SSL_ST_BEFORE:
 221         case SSL_ST_CONNECT:
 222         case SSL_ST_BEFORE | SSL_ST_CONNECT:
 223         case SSL_ST_OK | SSL_ST_CONNECT:
 224
 225             s->server = 0;
 226             if (cb != NULL)
 227                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 228
 229             if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 230                 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
 231                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 232                 ret = -1;
 233                 s->state = SSL_ST_ERR;
 234                 goto end;
 235             }
 236
 237             /* s->version=SSL3_VERSION; */
 238             s->type = SSL_ST_CONNECT;
 239
 240             if (s->init_buf == NULL) {
 241                 if ((buf = BUF_MEM_new()) == NULL) {
 242                     ret = -1;
 243                     s->state = SSL_ST_ERR;
 244                     goto end;
 245                 }
 246                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 247                     ret = -1;
 248                     s->state = SSL_ST_ERR;
 249                     goto end;
 250                 }
 251                 s->init_buf = buf;
 252                 buf = NULL;
 253             }
 254
 255             if (!ssl3_setup_buffers(s)) {
 256                 ret = -1;
 257                 s->state = SSL_ST_ERR;
 258                 goto end;
 259             }
 260
 261             /* setup buffing BIO */
 262             if (!ssl_init_wbio_buffer(s, 0)) {
 263                 ret = -1;
 264                 s->state = SSL_ST_ERR;
 265                 goto end;
 266             }
 267
 268             /* don't push the buffering BIO quite yet */
 269
 270             s->state = SSL3_ST_CW_CLNT_HELLO_A;
 271             s->ctx->stats.sess_connect++;
 272             s->init_num = 0;
 273             /* mark client_random uninitialized */
 274             memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
 275             s->d1->send_cookie = 0;
 276             s->hit = 0;
 277             s->d1->change_cipher_spec_ok = 0;
 278             /*
 279              * Should have been reset by ssl3_get_finished, too.
 280              */
 281             s->s3->change_cipher_spec = 0;
 282             break;
 283
 284 #ifndef OPENSSL_NO_SCTP
 285         case DTLS1_SCTP_ST_CR_READ_SOCK:
 286
 287             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 288                 s->s3->in_read_app_data = 2;
 289                 s->rwstate = SSL_READING;
 290                 BIO_clear_retry_flags(SSL_get_rbio(s));
 291                 BIO_set_retry_read(SSL_get_rbio(s));
 292                 ret = -1;
 293                 goto end;
 294             }
 295
 296             s->state = s->s3->tmp.next_state;
 297             break;
 298
 299         case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 300             /* read app data until dry event */
 301
 302             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 303             if (ret < 0)
 304                 goto end;
 305
 306             if (ret == 0) {
 307                 s->s3->in_read_app_data = 2;
 308                 s->rwstate = SSL_READING;
 309                 BIO_clear_retry_flags(SSL_get_rbio(s));
 310                 BIO_set_retry_read(SSL_get_rbio(s));
 311                 ret = -1;
 312                 goto end;
 313             }
 314
 315             s->state = s->d1->next_state;
 316             break;
 317 #endif
 318
 319         case SSL3_ST_CW_CLNT_HELLO_A:
 320         case SSL3_ST_CW_CLNT_HELLO_B:
 321
 322             s->shutdown = 0;
 323
 324             /* every DTLS ClientHello resets Finished MAC */
 325             ssl3_init_finished_mac(s);
 326
 327             dtls1_start_timer(s);
 328             ret = ssl3_client_hello(s);
 329             if (ret <= 0)
 330                 goto end;
 331
 332             if (s->d1->send_cookie) {
 333                 s->state = SSL3_ST_CW_FLUSH;
 334                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 335             } else
 336                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 337
 338             s->init_num = 0;
 339
 340 #ifndef OPENSSL_NO_SCTP
 341             /* Disable buffering for SCTP */
 342             if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 343 #endif
 344                 /*
 345                  * turn on buffering for the next lot of output
 346                  */
 347                 if (s->bbio != s->wbio)
 348                     s->wbio = BIO_push(s->bbio, s->wbio);
 349 #ifndef OPENSSL_NO_SCTP
 350             }
 351 #endif
 352
 353             break;
 354
 355         case SSL3_ST_CR_SRVR_HELLO_A:
 356         case SSL3_ST_CR_SRVR_HELLO_B:
 357             ret = ssl3_get_server_hello(s);
 358             if (ret <= 0)
 359                 goto end;
 360             else {
 361                 if (s->hit) {
 362 #ifndef OPENSSL_NO_SCTP
 363                     /*
 364                      * Add new shared key for SCTP-Auth, will be ignored if
 365                      * no SCTP used.
 366                      */
 367                     snprintf((char *)labelbuffer,
 368                              sizeof(DTLS1_SCTP_AUTH_LABEL),
 369                              DTLS1_SCTP_AUTH_LABEL);
 370
 371                     SSL_export_keying_material(s, sctpauthkey,
 372                                                sizeof(sctpauthkey),
 373                                                labelbuffer,
 374                                                sizeof(labelbuffer), NULL, 0,
 375                                                0);
 376
 377                     BIO_ctrl(SSL_get_wbio(s),
 378                              BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 379                              sizeof(sctpauthkey), sctpauthkey);
 380 #endif
 381
 382                     s->state = SSL3_ST_CR_FINISHED_A;
 383                 } else
 384                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 385             }
 386             s->init_num = 0;
 387             break;
 388
 389         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 390         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 391
 392             ret = dtls1_get_hello_verify(s);
 393             if (ret <= 0)
 394                 goto end;
 395             dtls1_stop_timer(s);
 396             if (s->d1->send_cookie) /* start again, with a cookie */
 397                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 398             else
 399                 s->state = SSL3_ST_CR_CERT_A;
 400             s->init_num = 0;
 401             break;
 402
 403         case SSL3_ST_CR_CERT_A:
 404         case SSL3_ST_CR_CERT_B:
 405             /* Check if it is anon DH or PSK */
 406             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 407                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 408                 ret = ssl3_get_server_certificate(s);
 409                 if (ret <= 0)
 410                     goto end;
 411 #ifndef OPENSSL_NO_TLSEXT
 412                 if (s->tlsext_status_expected)
 413                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 414                 else
 415                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 416             } else {
 417                 skip = 1;
 418                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 419             }
 420 #else
 421             } else
 422                 skip = 1;
 423
 424             s->state = SSL3_ST_CR_KEY_EXCH_A;
 425 #endif
 426             s->init_num = 0;
 427             break;
 428
 429         case SSL3_ST_CR_KEY_EXCH_A:
 430         case SSL3_ST_CR_KEY_EXCH_B:
 431             ret = ssl3_get_key_exchange(s);
 432             if (ret <= 0)
 433                 goto end;
 434             s->state = SSL3_ST_CR_CERT_REQ_A;
 435             s->init_num = 0;
 436
 437             /*
 438              * at this point we check that we have the required stuff from
 439              * the server
 440              */
 441             if (!ssl3_check_cert_and_algorithm(s)) {
 442                 ret = -1;
 443                 s->state = SSL_ST_ERR;
 444                 goto end;
 445             }
 446             break;
 447
 448         case SSL3_ST_CR_CERT_REQ_A:
 449         case SSL3_ST_CR_CERT_REQ_B:
 450             ret = ssl3_get_certificate_request(s);
 451             if (ret <= 0)
 452                 goto end;
 453             s->state = SSL3_ST_CR_SRVR_DONE_A;
 454             s->init_num = 0;
 455             break;
 456
 457         case SSL3_ST_CR_SRVR_DONE_A:
 458         case SSL3_ST_CR_SRVR_DONE_B:
 459             ret = ssl3_get_server_done(s);
 460             if (ret <= 0)
 461                 goto end;
 462             dtls1_stop_timer(s);
 463             if (s->s3->tmp.cert_req)
 464                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 465             else
 466                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 467             s->init_num = 0;
 468
 469 #ifndef OPENSSL_NO_SCTP
 470             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 471                 state == SSL_ST_RENEGOTIATE)
 472                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 473             else
 474 #endif
 475                 s->state = s->s3->tmp.next_state;
 476             break;
 477
 478         case SSL3_ST_CW_CERT_A:
 479         case SSL3_ST_CW_CERT_B:
 480         case SSL3_ST_CW_CERT_C:
 481         case SSL3_ST_CW_CERT_D:
 482             dtls1_start_timer(s);
 483             ret = ssl3_send_client_certificate(s);
 484             if (ret <= 0)
 485                 goto end;
 486             s->state = SSL3_ST_CW_KEY_EXCH_A;
 487             s->init_num = 0;
 488             break;
 489
 490         case SSL3_ST_CW_KEY_EXCH_A:
 491         case SSL3_ST_CW_KEY_EXCH_B:
 492             dtls1_start_timer(s);
 493             ret = ssl3_send_client_key_exchange(s);
 494             if (ret <= 0)
 495                 goto end;
 496
 497 #ifndef OPENSSL_NO_SCTP
 498             /*
 499              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 500              * used.
 501              */
 502             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 503                      DTLS1_SCTP_AUTH_LABEL);
 504
 505             SSL_export_keying_material(s, sctpauthkey,
 506                                        sizeof(sctpauthkey), labelbuffer,
 507                                        sizeof(labelbuffer), NULL, 0, 0);
 508
 509             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 510                      sizeof(sctpauthkey), sctpauthkey);
 511 #endif
 512
 513             /*
 514              * EAY EAY EAY need to check for DH fix cert sent back
 515              */
 516             /*
 517              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 518              * sent, but no verify packet is sent
 519              */
 520             if (s->s3->tmp.cert_req == 1) {
 521                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 522             } else {
 523 #ifndef OPENSSL_NO_SCTP
 524                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 525                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 526                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 527                 } else
 528 #endif
 529                     s->state = SSL3_ST_CW_CHANGE_A;
 530             }
 531
 532             s->init_num = 0;
 533             break;
 534
 535         case SSL3_ST_CW_CERT_VRFY_A:
 536         case SSL3_ST_CW_CERT_VRFY_B:
 537             dtls1_start_timer(s);
 538             ret = ssl3_send_client_verify(s);
 539             if (ret <= 0)
 540                 goto end;
 541 #ifndef OPENSSL_NO_SCTP
 542             if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 543                 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 544                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 545             } else
 546 #endif
 547                 s->state = SSL3_ST_CW_CHANGE_A;
 548             s->init_num = 0;
 549             break;
 550
 551         case SSL3_ST_CW_CHANGE_A:
 552         case SSL3_ST_CW_CHANGE_B:
 553             if (!s->hit)
 554                 dtls1_start_timer(s);
 555             ret = dtls1_send_change_cipher_spec(s,
 556                                                 SSL3_ST_CW_CHANGE_A,
 557                                                 SSL3_ST_CW_CHANGE_B);
 558             if (ret <= 0)
 559                 goto end;
 560
 561             s->state = SSL3_ST_CW_FINISHED_A;
 562             s->init_num = 0;
 563
 564             s->session->cipher = s->s3->tmp.new_cipher;
 565 #ifdef OPENSSL_NO_COMP
 566             s->session->compress_meth = 0;
 567 #else
 568             if (s->s3->tmp.new_compression == NULL)
 569                 s->session->compress_meth = 0;
 570             else
 571                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 572 #endif
 573             if (!s->method->ssl3_enc->setup_key_block(s)) {
 574                 ret = -1;
 575                 s->state = SSL_ST_ERR;
 576                 goto end;
 577             }
 578
 579             if (!s->method->ssl3_enc->change_cipher_state(s,
 580                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 581             {
 582                 ret = -1;
 583                 s->state = SSL_ST_ERR;
 584                 goto end;
 585             }
 586 #ifndef OPENSSL_NO_SCTP
 587             if (s->hit) {
 588                 /*
 589                  * Change to new shared key of SCTP-Auth, will be ignored if
 590                  * no SCTP used.
 591                  */
 592                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 593                          0, NULL);
 594             }
 595 #endif
 596
 597             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 598             break;
 599
 600         case SSL3_ST_CW_FINISHED_A:
 601         case SSL3_ST_CW_FINISHED_B:
 602             if (!s->hit)
 603                 dtls1_start_timer(s);
 604             ret = ssl3_send_finished(s,
 605                                      SSL3_ST_CW_FINISHED_A,
 606                                      SSL3_ST_CW_FINISHED_B,
 607                                      s->method->
 608                                      ssl3_enc->client_finished_label,
 609                                      s->method->
 610                                      ssl3_enc->client_finished_label_len);
 611             if (ret <= 0)
 612                 goto end;
 613             s->state = SSL3_ST_CW_FLUSH;
 614
 615             /* clear flags */
 616             s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
 617             if (s->hit) {
 618                 s->s3->tmp.next_state = SSL_ST_OK;
 619 #ifndef OPENSSL_NO_SCTP
 620                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 621                     s->d1->next_state = s->s3->tmp.next_state;
 622                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 623                 }
 624 #endif
 625                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 626                     s->state = SSL_ST_OK;
 627 #ifndef OPENSSL_NO_SCTP
 628                     if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 629                         s->d1->next_state = SSL_ST_OK;
 630                         s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 631                     }
 632 #endif
 633                     s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 634                     s->s3->delay_buf_pop_ret = 0;
 635                 }
 636             } else {
 637 #ifndef OPENSSL_NO_SCTP
 638                 /*
 639                  * Change to new shared key of SCTP-Auth, will be ignored if
 640                  * no SCTP used.
 641                  */
 642                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 643                          0, NULL);
 644 #endif
 645
 646 #ifndef OPENSSL_NO_TLSEXT
 647                 /*
 648                  * Allow NewSessionTicket if ticket expected
 649                  */
 650                 if (s->tlsext_ticket_expected)
 651                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 652                 else
 653 #endif
 654
 655                     s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
 656             }
 657             s->init_num = 0;
 658             break;
 659
 660 #ifndef OPENSSL_NO_TLSEXT
 661         case SSL3_ST_CR_SESSION_TICKET_A:
 662         case SSL3_ST_CR_SESSION_TICKET_B:
 663             ret = ssl3_get_new_session_ticket(s);
 664             if (ret <= 0)
 665                 goto end;
 666             s->state = SSL3_ST_CR_FINISHED_A;
 667             s->init_num = 0;
 668             break;
 669
 670         case SSL3_ST_CR_CERT_STATUS_A:
 671         case SSL3_ST_CR_CERT_STATUS_B:
 672             ret = ssl3_get_cert_status(s);
 673             if (ret <= 0)
 674                 goto end;
 675             s->state = SSL3_ST_CR_KEY_EXCH_A;
 676             s->init_num = 0;
 677             break;
 678 #endif
 679
 680         case SSL3_ST_CR_FINISHED_A:
 681         case SSL3_ST_CR_FINISHED_B:
 682             s->d1->change_cipher_spec_ok = 1;
 683             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 684                                     SSL3_ST_CR_FINISHED_B);
 685             if (ret <= 0)
 686                 goto end;
 687             dtls1_stop_timer(s);
 688
 689             if (s->hit)
 690                 s->state = SSL3_ST_CW_CHANGE_A;
 691             else
 692                 s->state = SSL_ST_OK;
 693
 694 #ifndef OPENSSL_NO_SCTP
 695             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 696                 state == SSL_ST_RENEGOTIATE) {
 697                 s->d1->next_state = s->state;
 698                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 699             }
 700 #endif
 701
 702             s->init_num = 0;
 703             break;
 704
 705         case SSL3_ST_CW_FLUSH:
 706             s->rwstate = SSL_WRITING;
 707             if (BIO_flush(s->wbio) <= 0) {
 708                 /*
 709                  * If the write error was fatal, stop trying
 710                  */
 711                 if (!BIO_should_retry(s->wbio)) {
 712                     s->rwstate = SSL_NOTHING;
 713                     s->state = s->s3->tmp.next_state;
 714                 }
 715
 716                 ret = -1;
 717                 goto end;
 718             }
 719             s->rwstate = SSL_NOTHING;
 720             s->state = s->s3->tmp.next_state;
 721             break;
 722
 723         case SSL_ST_OK:
 724             /* clean a few things up */
 725             ssl3_cleanup_key_block(s);
 726
 727             /*
 728              * If we are not 'joining' the last two packets, remove the
 729              * buffering now
 730              */
 731             if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 732                 ssl_free_wbio_buffer(s);
 733             /* else do it later in ssl3_write */
 734
 735             s->init_num = 0;
 736             s->renegotiate = 0;
 737             s->new_session = 0;
 738
 739             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 740             if (s->hit)
 741                 s->ctx->stats.sess_hit++;
 742
 743             ret = 1;
 744             /* s->server=0; */
 745             s->handshake_func = dtls1_connect;
 746             s->ctx->stats.sess_connect_good++;
 747
 748             if (cb != NULL)
 749                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 750
 751             /* done with handshaking */
 752             s->d1->handshake_read_seq = 0;
 753             s->d1->next_handshake_write_seq = 0;
 754             goto end;
 755             /* break; */
 756
 757         case SSL_ST_ERR:
 758         default:
 759             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 760             ret = -1;
 761             goto end;
 762             /* break; */
 763         }
 764
 765         /* did we do anything */
 766         if (!s->s3->tmp.reuse_message && !skip) {
 767             if (s->debug) {
 768                 if ((ret = BIO_flush(s->wbio)) <= 0)
 769                     goto end;
 770             }
 771
 772             if ((cb != NULL) && (s->state != state)) {
 773                 new_state = s->state;
 774                 s->state = state;
 775                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 776                 s->state = new_state;
 777             }
 778         }
 779         skip = 0;
 780     }
 781  end:
 782     s->in_handshake--;
 783
 784 #ifndef OPENSSL_NO_SCTP
 785     /*
 786      * Notify SCTP BIO socket to leave handshake mode and allow stream
 787      * identifier other than 0. Will be ignored if no SCTP is used.
 788      */
 789     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 790              s->in_handshake, NULL);
 791 #endif
 792
 793     BUF_MEM_free(buf);
 794     if (cb != NULL)
 795         cb(s, SSL_CB_CONNECT_EXIT, ret);
 796     return (ret);
 797 }
 798
 799 static int dtls1_get_hello_verify(SSL *s)
 800 {
 801     int n, al, ok = 0;
 802     unsigned char *data;
 803     unsigned int cookie_len;
 804
 805     s->first_packet = 1;
 806     n = s->method->ssl_get_message(s,
 807                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 808                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 809                                    -1, s->max_cert_list, &ok);
 810     s->first_packet = 0;
 811
 812     if (!ok)
 813         return ((int)n);
 814
 815     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 816         s->d1->send_cookie = 0;
 817         s->s3->tmp.reuse_message = 1;
 818         return (1);
 819     }
 820
 821     data = (unsigned char *)s->init_msg;
 822     data += 2;
 823
 824     cookie_len = *(data++);
 825     if (cookie_len > sizeof(s->d1->cookie)) {
 826         al = SSL_AD_ILLEGAL_PARAMETER;
 827         goto f_err;
 828     }
 829
 830     memcpy(s->d1->cookie, data, cookie_len);
 831     s->d1->cookie_len = cookie_len;
 832
 833     s->d1->send_cookie = 1;
 834     return 1;
 835
 836  f_err:
 837     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 838     s->state = SSL_ST_ERR;
 839     return -1;
 840 }